Matchless 1964 G3 350 Instruction Book page 38

Remove the bolt securing the automatic timing control to the cam wheel shaft.
Fit a 024328 withdrawal bolt in place of the fixing bolt removed which should be lightly
tightened. A sharp blow on the end of withdrawal bolt will dislodge the unit from the
shaft.
Do not disturb the contact breaker cam.
CONTACTS
CAPACITOR
SETTING THE IGNITION TIMING
Maximum advance 500 c.c. also 350 with engine number before 41575 full advance
½" or 39 deg (12·7 mm), ·350 after 41575 11/32" or 34 deg. (8·73 mm). W i t h the A.T.C.
retarded use 1/8" for ½" or 3/16" in place of 11/32"
To set the timing have available a stiff wheel spoke or similar object 5½" long.
Remove H.T. cable and sparking plug.
„ Automatic timing control as already described.
„ The rocker box side cover.
Turn engine so that both valves are closed (inlet valve opens then closes) then engage
top gear.
Insert timing rod through sparking plug hole, feel piston by rocking engine forwards
or backwards by turning the rear wheel until it can be felt that the piston is at the extreme
top of its stroke with both valves closed.
Refer to illustration 19, and fit automatic advance control, with the gap formed by the
two bob weights in line with the two tapped holes, used to secure contact breaker plate.
It should be noted that the peak of the cam, or narrowest part, when correctly positioned
Is approximately at 12 o'clock.
Press the unit firmly on to the shaft that drives it and give the end a sharp tap before
re-fitting the fixing bolt.
If fully advanced method is used.
TERMINAL NUT
CAM
Illustration 18
Insert a wood wedge between bob weights to fully separate
AUTOMATIC TIMING
CONTROL
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